Analytical ChemistryHard
Question
Ammonium salts on heating with slaked lime liberates a colourless gas (X). Identify the correct statement for gas (X).
Options
A.(X) turns red litmus blue and produces dense white fumes in contact with dilute HCl.
B.(X) turns filter paper moistened with mercurous nitrate black and gives intense blue coloured solution with CuSO4(aq).
C.(X) when passed through Nessler′s reagent produces a brown colour precipitate.
D.All of these.
Solution
NH4+ + OH- 
NH3 + H2O.
(A) NH3, alkaline in nature turns red litmus blue;
NH3 + HCl NH4Cl (white fumes)
(B) 2Hg NO3 + 2NH3 →
+ NH4NO3 ; CuSO4 + 4NH3 → [Cu(NH3)4] SO4 (intense blue)
(C) 2K2 (HgI4) + NH3 + 3KOH → HgOHgNH2I ↓ (brown) + 7KI + 2H2O
NH3 + H2O.(A) NH3, alkaline in nature turns red litmus blue;
NH3 + HCl NH4Cl (white fumes)
(B) 2Hg NO3 + 2NH3 →
+ NH4NO3 ; CuSO4 + 4NH3 → [Cu(NH3)4] SO4 (intense blue)(C) 2K2 (HgI4) + NH3 + 3KOH → HgOHgNH2I ↓ (brown) + 7KI + 2H2O
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